7.62mm

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Two different real-life rifle cartridges designated "7.62mm" are used in the Fallout series. They are sometimes treated as interchangeable, as in Fallout Tactics.

The 7.62x51mm NATO cartridge consists of a bullet with a gilding metal jacket and a lead antimony slug. It is a boat tailed bullet (rear of bullet is tapered) and weighs 145 or 150 grains. The tip of the bullet is not colored. The base of the cartridge is stamped with the year of manufacture and a circle that has vertical and horizontal lines, sectioning it into quarters. Its spread (accuracy standard) for a 10-shot group is no more than 12 inches at 600 yards.

The 7.62x39mm is an intermediate cartridge of Soviet origin. It is most famous for being used by the AK-47 and its many clones and derivatives.

7.62mm rounds are not likely to see much use, fitting only the FN FAL, its upgrades, and the rare M60. While slightly superior to .45 caliber, 7.62mm still lags with the bonuses of 5mm JHP, 4.7mm caseless, or 2mm EC, perhaps making its late game usefulness questionable. However, the FN FAL night sight can be of use early on, when darkness can hamper shooting skills.